“…In 12 of 20 case reports, the tooth that was replaced with implant, which developed RPI lesion, had previous RCT 24,27,29‐35,40,42,43 . Of 95 implants with RPI analyzed in this study, 27 implant sites had a tooth with previous RCT and 35 had teeth that did not have any endodontic treatment; whether a previously extracted tooth had any endodontic treatment history was not provided for 33 implants 20,24,27‐36,38‐45 . Five implants did not improve with treatment and were subsequently removed 20,35,36,44 …”